package com.lanjiyin.cloud.common.util.security;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import com.lanjiyin.cloud.common.util.security.coder.Base64;


public class AESUtil {
	/*
	 * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
	 */
	private String sKey = "fd46p1f8c9e578d8";
	private String ivParameter = "fd46p1f8c9e578d8";
	private static AESUtil instance = null;

	private AESUtil() {
	}

	public static AESUtil getInstance() {
		if (instance == null)
			instance = new AESUtil();
		return instance;
	}

	public String encrypt(String encData, String secretKey, String vector) throws Exception {
		
		if (secretKey == null) {
			return null;
		}
		if (secretKey.length() != 16) {
			return null;
		}
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		byte[] raw = secretKey.getBytes();
		SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
		IvParameterSpec iv = new IvParameterSpec(vector.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
		cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
		byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
		return Base64.encode(encrypted);
	}

	// 加密
	public String encrypt(String sSrc) {
		try {
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
			byte[] raw = sKey.getBytes();
			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
			IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
			cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
			byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
			return Base64.encode(encrypted);
		} catch (Exception se) {
			return null;
		}
	}

	// 解密
	public String decrypt(String sSrc) {
		try {
			byte[] raw = sKey.getBytes("ASCII");
			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
			IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
			cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
			byte[] encrypted1 = Base64.decode(sSrc);// 先用base64解密
			byte[] original = cipher.doFinal(encrypted1);
			String originalString = new String(original, "utf-8");
			return originalString;
		} catch (Exception ex) {
			return null;
		}
	}

	public String decrypt(String sSrc, String key, String ivs) {
		try {
			byte[] raw = key.getBytes("ASCII");
			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
			IvParameterSpec iv = new IvParameterSpec(ivs.getBytes());
			cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
			byte[] encrypted1 = Base64.decode(sSrc);// 先用base64解密
			byte[] original = cipher.doFinal(encrypted1);
			String originalString = new String(original, "utf-8");
			return originalString;
		} catch (Exception ex) {
			return null;
		}
	}
	public String decryptWx(String sSrc, String sKey, String ivParameter){
        try {
            byte[] raw = Base64.decode(sKey);
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            IvParameterSpec iv = new IvParameterSpec(Base64.decode(ivParameter));
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] myendicod = Base64.decode(sSrc);
            byte[] original = cipher.doFinal(myendicod);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
        	ex.printStackTrace();
            return null;
        }
    }
	public String encodeBytes(byte[] bytes) {
		StringBuffer strBuf = new StringBuffer();

		for (int i = 0; i < bytes.length; i++) {
			strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
			strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
		}

		return strBuf.toString();
	}

//	public static void main(String[] args) throws Exception {
//		// 需要加密的字串
//		String cSrc = "123456";
//
//		// 加密
////		long lStart = System.currentTimeMillis();
////		String enString = AESUtil.getInstance().encrypt(cSrc);
////		System.out.println("加密后的字串是：" + enString);
////
////		long lUseTime = System.currentTimeMillis() - lStart;
////		System.out.println("加密耗时：" + lUseTime + "毫秒");
////		// 解密
////		lStart = System.currentTimeMillis();
////		String DeString = AESUtil.getInstance().decrypt(enString);
////		System.out.println("解密后的字串是：" + DeString);
////		lUseTime = System.currentTimeMillis() - lStart;
////		System.out.println("解密耗时：" + lUseTime + "毫秒");
//	}
}